La commande 'hostent' permet de manipuler les lignes du fichier '/etc/hosts'.
Ainsi, il est possible d'afficher, de modifier ou de supprimer des entrées dans ce fichier.
Ainsi, pour ajouter une ligne concernant le nouveau système Server1 ayant l'Adresse IP 192.168.1.1, il suffit de saisir la commande :
# hostent -a Adresse_IP -h "Server1"
A l'opposé, pour supprimer une entrée, il suffit de lancer :
# hostent-d Ip_adresse
POur afficher toutes les entrées du fichier, lancer la commande :
# hostent -S [-Z]
hostent Command
Purpose
Directly manipulates address-mapping entries in the system configuration database.
Syntax
To Add an Address-to-Host Name Mapping
hostent -a IPAddress -h "HostName..."
To Delete an Address-to-Host Name Mapping
hostent -d IPAddress
To Delete All Address-to-Host Name Mappings
hostent -X
To Change an Address-to-Host Name Mapping
hostent -c IPAddress -h "HostName..." [ -i NewIPAddress ]
To Show an Address or Host Name in Colon Format
hostent -s { IPAddress | "HostName" } [ -Z ]
To Show all Address-to-Host Name Mappings in Colon Format
hostent -S [ -Z ]
Description
The hostent low-level command adds, deletes, or changes address-mapping entries in the system configuration
database. Entries in the database are used to map an Internet Protocol (IP) address (local or remote) to its
equivalent host names.
The hostent command can show one or all address-to-host name mapping entries in the /etc/hosts file. An Internet
Protocol (IP) address of a given local or remote host might be associated with one or more host names. Represent an
IP address in dotted decimal format. Represent a host name as a string with a maximum length of 255 characters, and
use no blank characters. Each entry must be contained on one line. Multiple HostNames (or aliases) can be specified.
Note: Valid host names or alias host names must contain at least one alphabetic character. If you choose to specify
a host name or alias that begins with an x followed by any hexadecimal digit (0-f), the host name or alias must also
contain at least one additional letter that cannot be expressed as a hexadecimal digit. The system interprets a
leading x followed by a hexadecimal digit as the base 16 representation of an address unless there is at least one
character in the host name or alias that is not a hexadecimal digit. Thus, xdeer would be a valid host name, whereas
xdee would not.
You can use the System application in Web-based System Manager (wsm) to change system characteristics. You can also
use the System Management Interface Tool (SMIT) smit hostent fast path to run this command.
Flags
Note: The -a, -d, -c, and -s flags cannot be used together.
Item
Description
-a IPAddress
Adds an IP address-to-host name mapping entry for the Internet Protocol address in the database. Specify the
host names with the -h flag.
-c IPAddress
Changes an IP address-to-host name mapping entry in the database that corresponds to the address that is
specified by the IPAddress variable. Specify the changed host names with the -h flag. If you want to change the
current IP address to a new address (IPAddress), use the -i flag.
-d IPAddress
Deletes the IP address-to-host name mapping entry in the database that corresponds to the address that is
specified by the IPAddress variable.
-h"HostName..."
Specifies a list of host names. Entries in the list are to be separated by blanks. The -h"HostName..." flag
should be used with the -a flag. The -c flag might also require the -h"HostName..." flag.
-i NewIPAddress
Specifies a new IP address. This flag is required by the -c flag if an existing IP address is to be replaced by
the NewIPAddress variable.
-S
Shows all entries in the database.
-s"HostName"
Shows an IP address-to-host name mapping entry matching the host name specified by the "HostName" variable.
-s IPAddress
Shows an IP address-to-host name mapping entry matching the entry specified by the IPAddress variable.
-X
Deletes all IP address-to-host name mapping entries in the database.
-Z
Generates the report of the query in colon format. This flag is used when the hostent command is started from
the SMIT usability interface.
Note: The hostent command does recognize the following addresses: .08, .008, .09, and .009. Addresses with
leading zeros are interpreted as octal, and numerals in octal cannot contain 8s or 9s.
Security
Attention RBAC users and Trusted AIX users: This command can perform privileged operations. Only privileged users
can run privileged operations. For more information about authorizations and privileges, see Privileged Command
Database in Security. For a list of privileges and the authorizations associated with this command, see the
lssecattr command or the getcmdattr subcommand.
Examples
1 To add an entry in the database associating an address with a series of host names, enter the command in the
following format:
hostent -a 192.100.201.7 -h "alpha bravo charlie" In example 1, the IP address 192.100.201.7 is specified as
the address of the host that has a primary host name of alpha with synonyms of bravo and charlie.
2 To show an entry in the database matching a host name, enter the command in the following format:
hostent -s alpha In example 2, the entry to be shown matches the host name alpha.
3 To change the IP address of an entry to a new IP address, enter the command in the following format:
hostent -c 192.100.201.7 -i 192.100.201.8 In example 3, the old IP address is 192.100.201.7 and the new address
is 192.100.201.8.
Files
Item
Description
/etc/hosts
Contains host names and addresses for the network.
